Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub&...Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>13</sub>, β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>, and γ-Bi<sub>2</sub>MoO<sub>6</sub>, has been studied with XPS. The results show that, owing to the presence of the oxygen anion bridge in Bi(Ⅲ)-O(Ⅱ)-Mo(Ⅵ), the reduction behavior of Bi(Ⅲ) and Mo(Ⅵ) metal ions in all the three complex oxides is contrary to that in the single oxides. While Mo(Ⅵ) in MoO<sub>3</sub> is reduced to Mo(Ⅵ) in UHV under Ar<sup>+</sup> ion bombardment, the valence state of Bi(Ⅲ) in Bi<sub>2</sub>O<sub>3</sub> is unchanged. However, Bi(Ⅲ) in the three complex oxides is reduced to Bi(0) without noticeable reduction of Mo(Ⅵ). Nevertheless, the rates of Bi(Ⅲ) reduction are in correspondence with the difference in Bi/Mo atomic ratio and the crystallographic features of the three phases of bismuth molybdate are decreasing in the order of α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>≥β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>】γ-Bi<sub>2</sub>MoO<sub>6</sub>. A new O -species is observed on the bismuth molybdate surface reduced by Ar<sup>+</sup> ion bombardment.Wc discuss the above phenomena展开更多
基金Project supported by the National Natural Science Foundation of China
文摘Ar<sup>+</sup> ion bombardment induced reduction effect on Bi<sub>2</sub>O<sub>3</sub>, MoO<sub>3</sub> and Bi-Mo complex oxides, α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>13</sub>, β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>, and γ-Bi<sub>2</sub>MoO<sub>6</sub>, has been studied with XPS. The results show that, owing to the presence of the oxygen anion bridge in Bi(Ⅲ)-O(Ⅱ)-Mo(Ⅵ), the reduction behavior of Bi(Ⅲ) and Mo(Ⅵ) metal ions in all the three complex oxides is contrary to that in the single oxides. While Mo(Ⅵ) in MoO<sub>3</sub> is reduced to Mo(Ⅵ) in UHV under Ar<sup>+</sup> ion bombardment, the valence state of Bi(Ⅲ) in Bi<sub>2</sub>O<sub>3</sub> is unchanged. However, Bi(Ⅲ) in the three complex oxides is reduced to Bi(0) without noticeable reduction of Mo(Ⅵ). Nevertheless, the rates of Bi(Ⅲ) reduction are in correspondence with the difference in Bi/Mo atomic ratio and the crystallographic features of the three phases of bismuth molybdate are decreasing in the order of α-Bi<sub>2</sub>Mo<sub>3</sub>O<sub>12</sub>≥β-Bi<sub>2</sub>Mo<sub>2</sub>O<sub>9</sub>】γ-Bi<sub>2</sub>MoO<sub>6</sub>. A new O -species is observed on the bismuth molybdate surface reduced by Ar<sup>+</sup> ion bombardment.Wc discuss the above phenomena